bad news - just found 2 more types of CP5000 calipers in catalogue. Here goes:

CP5000-40/-43 Race disc sizes as above - differential bores

CP5000-50/-53 Race disc size 280-295 & 25.4 thick - equal bores

Previously mentioned calipers are CP5000-20/-21/-22/-23S4 - differential bores - "general use" - I guess if they haven't got dust seals are race spec